CN205959703U - Hot protection type piezoresistor - Google Patents
Hot protection type piezoresistor Download PDFInfo
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- CN205959703U CN205959703U CN201620905588.XU CN201620905588U CN205959703U CN 205959703 U CN205959703 U CN 205959703U CN 201620905588 U CN201620905588 U CN 201620905588U CN 205959703 U CN205959703 U CN 205959703U
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- electrode
- fuse
- lead
- protection type
- thermal protection
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Abstract
The utility model provides a hot protection type piezoresistor, includes medium chip, first electrode, second electrode, first lead wire, second lead wire and insulating bag seal, characterized by: hot protection type piezoresistor still includes the fuse, first lead wire upper end is connected with the first electrode, second lead wire upper end is connected with fuse one end, the fuse other end is connected with the second electrode, be equipped with the hot melt adhesive spacer body between fuse and the second electrode, the insulating bag seal is with medium chip, the first electrode, first lead wire upper end, the second electrode, the fuse, seal hot melt adhesive spacer body and second lead wire upper end, first lead wire lower extreme and second lead wire lower extreme stretch out to insulating bag seal outside. The utility model discloses well fuse fuses when piezoresistor's temperature reaches or surpass a certain upper limit value, the intensification that stops to generate heat of timely circuit break, messenger piezoresistor to effectively avoiding insulating bag seal high temperature to catch fire and arousing the conflagration, the security performance is high.
Description
Technical field
The utility model is related to resistor and in particular to a kind of Thermal protection type piezoresistor.
Background technology
Piezoresistor be a kind of have nonlinear wind vibration and have transient suppression overvoltage effect solid-state voltage quick
Sensing unit.A kind of existing piezoresistor, including dielectric chip, first electrode, second electrode, the first lead, the second lead
With insulation encapsulated layer, first electrode, second electrode be respectively arranged on the two sides of dielectric chip, the first lead upper end and the first electricity
Pole connects（Generally welded by scolding tin）, the second lead upper end is connected with second electrode（Generally welded by scolding tin）, insulating bag
Dielectric chip, first electrode, the first lead upper end, second electrode and the second lead upper end are sealed by sealing, under the first lead
End and the second lead lower end extend out to outside insulation encapsulated layer.Above-mentioned dielectric chip is usually zinc oxide varistor chip,
It is with zinc oxide (ZnO) as material of main part, and adds other trace elements multiple.This piezoresistor in use,
When piezoresistor temperature and being too high, because piezoresistor is still in on-state, piezoresistor can persistent fever
Heat up, be easily caused insulation encapsulated layer and catch fire and initiation fire accident, security is poor.
Content of the invention
Technical problem to be solved in the utility model is to provide a kind of Thermal protection type piezoresistor, this piezo-resistance
Device, when temperature meets or exceeds a certain higher limit, can cut off circuit in time, it is to avoid insulation encapsulated layer too high the catching fire of temperature and
Cause fire, security performance is high.Using technical scheme as follows：
A kind of Thermal protection type piezoresistor, including dielectric chip, first electrode, second electrode, the first lead, second draws
Line and insulation encapsulated layer, first electrode, second electrode are respectively arranged on the two sides of dielectric chip, it is characterized in that：Described heat is protected
Shield type piezoresistor also includes fuse, and the first lead upper end is connected with first electrode, the second lead upper end and fuse one
End connects, and the fuse other end is connected with second electrode, is provided with PUR spacer body, insulating bag between fuse and second electrode
Sealing is by dielectric chip, first electrode, the first lead upper end, second electrode, fuse, PUR spacer body and the second lead
End is sealed, and the first lead lower end and the second lead lower end extend out to outside insulation encapsulated layer.
Above-mentioned Thermal protection type piezoresistor is equivalent to a conventional piezo-resistance and is connected with fuse, when piezoresistor exists
When temperature meets or exceeds a certain higher limit, blown fuse, cut-out circuit connects, piezoresistor no longer heating power, from
And avoid insulating encapsulated layer too high the catching fire of temperature and cause fire.
Generally, scolding tin and first electrode welding are passed through in above-mentioned first lead upper end；Scolding tin and guarantor are passed through in second lead upper end
The welding of dangerous silk one end, the fuse other end is passed through scolding tin and is welded with second electrode.Above-mentioned dielectric chip can adopt zinc oxide pressure-sensitive
Resistor chip, it is with zinc oxide (ZnO) as material of main part, and adds other trace elements multiple.
Fuse and the second lead upper end are separated by above-mentioned PUR spacer body with second electrode, play insulating effect, prevent
Only fuse stage casing and the second lead upper end are contacted with second electrode.Above-mentioned PUR spacer body is generally also by fuse and second
Electrode is adhesively fixed together, makes fuse and the position of the second lead upper end be fixed holding.
In preferred version, above-mentioned PUR spacer body is wrapped in outside fuse（Generally, fuse except with second electrode
Outside the end connecting, remainder is all wrapped by PUR spacer body）, so, when piezoresistor is a certain in temperature arrival
During higher limit, blown fuse, PUR spacer body fusing simultaneously the fuse cladding by fusing, fuse can be avoided again
Connect.
Above-mentioned PUR spacer body is the solidfied material of PUR, can be using conventional PUR（As EVA hot-melt adhesive）Solidification
After formed.The softening temperature of PUR is usually 155 DEG C about.
Preferably above-mentioned fuse is the silk thread that the alloy in the range of 160-220 DEG C is made by fusing point, for example：By tin with
The silk thread that silver, the alloy of copper composition are made, its fusing point is about 217-218 DEG C；Or the silk being made up of the alloy that tin and lead form
Line, its fusing point is about 183 DEG C；Or the silk thread being made up of the alloy that tin is formed with lead, bismuth, its fusing point is about 183 DEG C.
Above-mentioned insulation encapsulated layer is generally formed using resistant to elevated temperatures epoxy resin, and the temperature that it is resistant to should be higher than that insurance
Silk and the fusing point of PUR, and reach 94V-0 standard.
Above-mentioned first electrode, second electrode can be silver electrode, copper electrode or nickel electrode etc..
In preferred version, above-mentioned Thermal protection type piezoresistor also includes auxiliary lead, auxiliary lead upper end and the second electricity
Pole connects（Auxiliary lead upper end is generally passed through scolding tin and is welded with second electrode）.Above-mentioned Thermal protection type piezoresistor accesses circuit
When, auxiliary lead may be connected to LED light, to point out whether Thermal protection type piezoresistor is in normal operating conditions.
The utility model by fuse with in-plant series system set in piezoresistor, fuse can be drawn
The heat that dielectric chip and electrode are sent out, the blown fuse when the temperature of piezoresistor meets or exceeds a certain higher limit,
Circuit can be cut off in time, so that piezoresistor is stopped heating up, encapsulated layer temperature is too high catches fire thus being prevented effectively from insulation
And causing fire, security performance is high.
Brief description
Fig. 1 is the structural representation of the utility model preferred embodiment 1；
Fig. 2 is the right view of the piezoresistor of Thermal protection type shown in Fig. 1（Save insulation encapsulated layer）；
Fig. 3 is the structural representation of the utility model preferred embodiment 2（Save insulation encapsulated layer）.
Specific embodiment
Embodiment 1
As depicted in figs. 1 and 2, this Thermal protection type piezoresistor includes dielectric chip 1, first electrode 2, second electrode
3rd, the first lead 4, the second lead 5, fuse 6 and insulation encapsulated layer 7, first electrode 2, second electrode 3 are respectively arranged on dielectric core
On the two sides of piece 1, the first lead 4 upper end is connected with first electrode 2（Scolding tin 8 and first electrode 2 are passed through in first lead 4 upper end
Welding）, the second lead 5 upper end is connected with fuse 6 one end, and fuse 6 other end is connected with second electrode 3（On second lead 5
End is welded with second electrode 3 by scolding tin 10 by scolding tin 9 and the welding of fuse 6 one end, fuse 6 other end）, fuse 6
It is provided with PUR spacer body 11 and second electrode 3 between, insulation encapsulated layer 7 is by dielectric chip 1, first electrode 2, the first lead 4
Upper end, second electrode 3, fuse 6, PUR spacer body 11 and the second lead 5 upper end are sealed, the first lead 4 lower end and
Two lead 5 lower end extend out to outside insulation encapsulated layer 7.
In the present embodiment, PUR spacer body 11 is wrapped in outside fuse 6（Fuse 6 is except being connected with second electrode 3
End outside, remainder is all wrapped by PUR spacer body 11）.
Dielectric chip 1 adopts zinc oxide varistor chip, and it is with zinc oxide (ZnO) as material of main part, and adds many
Plant other trace elements.
PUR spacer body 11 is the solidfied material of PUR, can be using conventional PUR（As EVA hot-melt adhesive）After solidification
Formed.
Fuse 6 can adopt one of following silk threads：The silk thread being made up of the alloy that tin is formed with silver, copper（Its fusing point
It is about 217-218 DEG C）, or the silk thread being made up of the alloy that tin and lead form（Its fusing point is about 183 DEG C）, or by tin with
The silk thread that lead, the alloy of bismuth composition are made（Its fusing point is about 183 DEG C）.
Insulation encapsulated layer 7 is formed using resistant to elevated temperatures epoxy resin, and the temperature that it is resistant to is higher than fuse 6 and hot melt
The fusing point of glue, and reach 94V-0 standard.
First electrode 2, second electrode 3 can be silver electrode, copper electrode or nickel electrode etc..
Above-mentioned Thermal protection type piezoresistor is equivalent to a conventional piezo-resistance and is connected with fuse, when piezoresistor exists
When temperature meets or exceeds a certain higher limit, fuse 6 fuses, and cut-out circuit connects, piezoresistor no longer heating power, from
And avoid insulating encapsulated layer too high the catching fire of temperature and cause fire.
Fuse 6 and the second lead 5 upper end are separated by PUR spacer body 11 with second electrode 3, play insulating effect, prevent
Only fuse 6 stage casing and the second lead 5 upper end are contacted with second electrode 3；PUR spacer body 11 is also by fuse 6 and the second electricity
Pole 3 is adhesively fixed together, makes fuse 6 and the position of the second lead 5 upper end be fixed holding；When piezoresistor is in temperature
When degree reaches a certain higher limit, fuse 6 fuses, and PUR spacer body 11 melts and coats the fuse 6 of fusing simultaneously, can
Fuse 6 is avoided to be again switched on.
Embodiment 2
As shown in figure 3, the present embodiment is with the difference of embodiment 1：Also include auxiliary lead 12, auxiliary lead 12
Upper end is connected with second electrode 3（Auxiliary lead 12 upper end is welded with second electrode 3 by scolding tin 10）.This pressure-sensitive electricity of Thermal protection type
When resistance device accesses circuit, auxiliary lead 12 may be connected to LED light, to point out whether Thermal protection type piezoresistor is just in
Often working condition.
Remaining structure of the present embodiment is same as Example 1.
Claims (8)
1. a kind of Thermal protection type piezoresistor, including dielectric chip, first electrode, second electrode, the first lead, the second lead
With insulation encapsulated layer, first electrode, second electrode are respectively arranged on the two sides of dielectric chip, it is characterized in that：Described Thermal protection
Type piezoresistor also includes fuse, and the first lead upper end is connected with first electrode, the second lead upper end and fuse one end
Connect, the fuse other end is connected with second electrode, between fuse and second electrode, be provided with PUR spacer body, insulation encapsulating
Layer is by dielectric chip, first electrode, the first lead upper end, second electrode, fuse, PUR spacer body and the second lead upper end
It is sealed, the first lead lower end and the second lead lower end extend out to outside insulation encapsulated layer.
2. Thermal protection type piezoresistor according to claim 1 it is characterised in that：Described PUR spacer body is wrapped in
Outside fuse.
3. Thermal protection type piezoresistor according to claim 1 and 2 it is characterised in that：Described fuse is by fusing point
The silk thread that alloy in the range of 160-220 DEG C is made.
4. Thermal protection type piezoresistor according to claim 3 it is characterised in that：Described fuse be by tin with silver,
The silk thread that the alloy of copper composition is made.
5. Thermal protection type piezoresistor according to claim 3 it is characterised in that：Described fuse is by tin and lead group
The silk thread that the alloy becoming is made.
6. Thermal protection type piezoresistor according to claim 3 it is characterised in that：Described fuse be by tin and lead,
The silk thread that the alloy of bismuth composition is made.
7. Thermal protection type piezoresistor according to claim 1 and 2 it is characterised in that：The pressure-sensitive electricity of described Thermal protection type
Resistance device also includes auxiliary lead, and auxiliary lead upper end is connected with second electrode.
8. Thermal protection type piezoresistor according to claim 3 it is characterised in that：Described Thermal protection type piezoresistor
Also include auxiliary lead, auxiliary lead upper end is connected with second electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620905588.XU CN205959703U (en) | 2016-08-20 | 2016-08-20 | Hot protection type piezoresistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620905588.XU CN205959703U (en) | 2016-08-20 | 2016-08-20 | Hot protection type piezoresistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205959703U true CN205959703U (en) | 2017-02-15 |
Family
ID=57977780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620905588.XU Active CN205959703U (en) | 2016-08-20 | 2016-08-20 | Hot protection type piezoresistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205959703U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565508A (en) * | 2017-10-25 | 2018-01-09 | 四川中光防雷科技股份有限公司 | TVS protective devices with failure breaking function |
| CN110024054A (en) * | 2017-10-13 | 2019-07-16 | 东莞令特电子有限公司 | Thermal protection metal-oxide varistor |
-
2016
- 2016-08-20 CN CN201620905588.XU patent/CN205959703U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110024054A (en) * | 2017-10-13 | 2019-07-16 | 东莞令特电子有限公司 | Thermal protection metal-oxide varistor |
| CN110024054B (en) * | 2017-10-13 | 2021-06-29 | 东莞令特电子有限公司 | Thermally protected metal oxide piezoresistor |
| CN107565508A (en) * | 2017-10-25 | 2018-01-09 | 四川中光防雷科技股份有限公司 | TVS protective devices with failure breaking function |
| CN107565508B (en) * | 2017-10-25 | 2019-09-27 | 四川中光防雷科技股份有限公司 | TVS protective device with failure breaking function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210322 Address after: 515000 east area and west area of Songtian science and Technology Park, Shantou Free Trade Zone, Guangdong Province Patentee after: SHANTOU FREE TRADE ZONE SONGTIAN ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 515000 No.9 Keji West Road, high tech Zone, Shantou City, Guangdong Province Patentee before: SHANTOU HIGH-NEW ZONE SONGTIAN ENTERPRISE Co.,Ltd. |
|
| TR01 | Transfer of patent right |